Merge "fix [2664345] Flash: Bad flicker at the end of a pinch zoom." into froyo

    GLuint textureName = mTextures[index].name;

    if (UNLIKELY(textureName == -1LU)) {

        // the texture has not been created yet, this Layer has

        // in fact never been drawn into. this happens frequently with

        // SurfaceView.

        clearWithOpenGL(clip);

        // in fact never been drawn into. This happens frequently with

        // SurfaceView because the WindowManager can't know when the client

        // has drawn the first time.

        // If there is nothing under us, we paint the screen in black, otherwise

        // we just skip this update.

        // figure out if there is something below us

        Region under;

        const SurfaceFlinger::LayerVector& drawingLayers(mFlinger->mDrawingState.layersSortedByZ);

        const size_t count = drawingLayers.size();

        for (size_t i=0 ; i<count ; ++i) {

            const sp<LayerBase>& layer(drawingLayers[i]);

            if (layer.get() == static_cast<LayerBase const*>(this))

                break;

            under.orSelf(layer->visibleRegionScreen);

        }

        // if not everything below us is covered, we plug the holes!

        Region holes(clip.subtract(under));

        if (!holes.isEmpty()) {

            clearWithOpenGL(holes);

        }

        return;

    }

    drawWithOpenGL(clip, mTextures[index]);